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engineering resin systems, such as polyimides and phenolics, generate reaction by-products (i.e., water) during curing. These by-products, together with the carrier solvents, must be effectively managed during the cure cycle in order to yield void-free quality laminate parts. A workable, robust, effective and low cost out-of-autoclave DVB processing technique for the management of volatiles is proposed. This technique affords superior volatile management during composite manufacturing. The problems associated with oven SVB processing are essentially eliminated. High quality, low void composite laminates can be produced consistently as evidenced by the optical photomicrographs. This DVB process for volatile management can be easily adapted to a variety of composite manufacturing processes. For resin matrices with low to moderate minimal viscosities (i.e., < 250 Poises), a vacuum-only DVB process in an oven is sufficient for void-free laminate consolidation. For resin matrices with viscosities higher than ~ 250 Poises, an autoclave or a press incorporated with the DVB process will afford additional pressure (i.e., greater than 14.7 Psi) for composite part consolidation. The DVB process proposed herein has a broad application in composite manufacturing. It is not only adaptable to manufacturing equipment such as ovens, autoclaves and presses, but also applicable to other important composite fabrication processes such as resin film infusion (RFI), resin transfer molding (RTM) and vacuum assisted resin transfer molding (VARTM) processes. These concepts are presently being pursued at the NASA Langley Research Center. Acknowledgement The 7781 E-glass/Cycom‚ 6070 prepreg provided by J. M. Bai of Cytec Engineering Materials, Anaheim, CA and the IM7/LARC‘ PETI-8 prepreg fabricated by R. J. Cano and R. E. Smith of NASA LARC, Hampton, VA have made the processing studies herein possible. References 1. P. A. Mehrkam and R. Cochran, “Wet Lay-up Materials for Repair of Bismaleimide Composites”, 24th International SAMPE Technical Conference, T1006-T1016, October 20-22, 1992. 2. L. B. Buckley, R. E. Trabocco and E. L. Rosenzweig, “Non-autoclave Processing for Composite Material Repair”, Naval Air Warfare Center, Warminster, PA, Report No. NADC- 83084-60, 1983. 3. T. M. Donnellan, E. L. Rosenzweig and R. C. Cochran, Second DOD/NASA Composites Repair Technology Workshop, Vol. 2, 349-364, 1986.PDF Image | Evaluation of Double-Vacuum-Bag Process For Composite Fabrication
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